Watchman&#39;s clock



C. H. JENKINS.

WATCHM ANS CLOCK. APPLICATION FILED Nov, 13, m5. 1,370,543. Patented Mar. 8,1921.

C(H. JENKINS.

WATCHMAN'S CLOCK.

APPLICATION FILED NOV. 13, 1915.

1370.543. Patented Mar. 8,1921.

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CHARLES H. JENKINS, or BEL EVILLE, New JERSEY, essIGNoR TO NEWMAN CLO K COMPANY, on NEW YORK, N. Y., A CORPORATION OF NEW YORK.

Application filed November 13, 1915.

particularly adapted for" use] in portable clocks whichare subjected to', rough usage.

One object of my inventionisto provide an improved mounting for the main spring which prevents damage to the train through recoil, should the main spring break. The

improved mounting also prevents 'jars or impacts to the casing affecting the main wheel. I

Another object of my invention to providea mechanism in which the driving ratio may be readily changed without the necessity of changing a large number of parts in the clock train. This'p'ermits the recording device to be easily changed,- for instance, from a 24 hour recorder to a 48 hour recorder, and vice'versa. I

. Another object of my invention is to improve the record'dial carrier construction, sothat the record dial carrier does not disassemble when the records are changed.

Other objectsof myinvention reside in the particular construction which makes a simple matter to assemble and repair the clock, and which construction also is cheap to manufacture and not likely to get out of order. V

In thedrawings,

Figure 1 shows a front elevational view of my improved clock, the dial being broken away to show the mechanism below."

' Fig. 2 shows a similar view "with the front cover plate removed -to'show the clock train.

Fig. 3 is a cross-sectional view of the train shown in Fig. 2, the view being taken on'line' 3-3 of that figure.

' Fig. 4 is another cross-sectional view taken on line 14 of Fig. 2.

Fig. 5 is an enlarged detail View of the cannon pinion'inplace on its arbor.

Fig; 6 is anotherdetail viewof theca-nnon pinion removed from the arbor. Referring to the-drawings indetail, the

Specificatioh of Letters Patent.

' -wn'renmnn's oLocx.

Patented Mar. 8, 1921.

Serial No. 61,212.

reference numeral 10 designates the front cover plate which is secured by screws 11 to posts 12 extending upwardly from the back plate 13 (see Figs. 1 and 2). Suitably supported on the front cover plate is the dial 1 1 with suitable markings thereon to intimate hours, minutes-etc. Carried by the front cover plate is an escapement of well known form, as shown in dotted lines at 15, Fig. 2. For access to the escapement mechanism, the portion 16 of the lower plate 13 opposite the escapement 15 can be detached from the rest of the plate, as

clearly indicated in Fig. 2. The detachable portion of the plate is preferably held to the remaining portion of the plate by the screws 17. This portion of the plate also contains a window aperture 30 through which the escapement may be inspected.

. Pivotally mounted between the front and rear cover plates are a number of intermeshing gears and pinions. Thegear 18 meshes with the pinion on the escapement and carries a pinion 19 which intermeshes with a gear 20 which in turn carries a pinion 21 which meshes with the teeth on a gear 22. This train of gears and pinions, together with the escapement 15, form no part of my invention, as they are of a form well known in the art.

- Thejgea'r 22 carries a pinion 23 which meshes with'the teeth of a main wheel 24, the'latterbeing rotatably mounted upon a stud 25. The stud carries a collar 26 which abuts against the plate 10. The outer end of the stud 25 is threaded to receive a cap nut 27 which holds the stud rigid on the cover plate 10. The stud 25 does not extend through the rear plate 13. It terminates some distance from this plate and this construction of carrying the stud on oneplate serves, among other things, to prevent jars from damaging the main wheel. p

The main wheel 24*.- is provided with two bosses 28-29. They surround (see Fig. 3) the stud 25, the lower one 29'being provided with a hook 31 which engages the inner end of a'main spring 32. The upper boss 28 forms a mounting for an intermediate wheel 33, which is secured to the boss by pinning or in any other desiredmanner. The main spring 32 is carried in a barrel 3%l,and at its outer end engages a hook 35 on said barrel. The base of the barrel is extendedand is provided with ratchet teeth 36, adapted to be engaged by aspring pressed pawl 37, which serves to hold the main spring against retrograde movement after the main spring is wound up. The arrangement of the ratchet with the barrel in close proximity to the plate 13 gives a solid construction and prevents the ratchet and pawl from accidentally disengaging.

In axial alinement with stud is an annular boss which extends from the base of the barrel and is journaled in the back plate 13. For holding the barrel in position and for winding up the main spring, I provide a member which is screw threaded into the boss and which has a collar 39 to engage he lower face of the boss and shoulder it] formed in the back plate 13. A squared extension all extending outwardly from said member serves for the reception 01": a key for winding the main spring. It will he understood that the threads which secure the member to the boss 38 and main spring barrel are ett't hand, so that the winding up of the spring do s not unscrew the member.

B'ieshing with the intermediate gear is a gear wheel 42 which is rigidly secured on an arbor 4:3. This arbor is journaled in the front plate and also is journaled and projects through the back plate. Here, the extended end shown at iiin Fig. 3 forms a support for a record dial carrier, which is of the type shown and described in my prior Patent No. 1,038,99l, to which reference may be made for a detailed description. Should it be desired that the record dial carrier be rotated at a slower or faster speed, 2'. 6., for record cards oi dif erent periods of time, say 2i and a8 hours, it is a simple matter to change the gear ratio between gear wheel l2 and the intermediate gear 33; that to say, by increasing the size of one and diminishing the size of the other. It will be understood that this change may be made without affecting the clock train in any way.

It has been found that it is advantageous to secure the record supporting plate 45 to th arbor H in some manner which would prevent the accidental displacement of said plate, when the cap 46 is removed for changing records. I accordin ly provide a circular plate spring 457 having radial slots and placed on the arbor between the plate 45 and the shoulder of the arbor 4:3. The end of the arbor is drilled and threaded to receive a cap screw L8. This cap screw, when in place, crowds the record plate 45 against the spring l7, and holds it securely to the arbor. The cap portion of the screw is of such size that the cap 46 can pass thereover when it is removed for changing records. The rounded corners 49 of the cap screw 18 also facilitate the replacing of the cap 46 since they act as cams to force the spring actuated plungers :30 inwardly.

Rigidly secured to the cover plate 10 is a stud 51 which forms a support for a pinion 52 having an extended tube 53 which carries the minute hand 54. A gear wheel 55 has a tubular portion 56 which carries the hour hand 57. The tube 53 rotates freely about stud 51 and tube 56 rotates freely about The minute hand pinion 52 and hour hand gear wheel 55 are driven by gear wheel 58 and pinion 59, respectively, which are rigidly mounted on the end ofa friction or cannon pinion arbor 60. This cannon pinion, together with its associate mechanism, will now be described.

The cannon pinion is shown in Fig. 6. It comprises a small pinion (31 which has extending therefrom a tubular portion 62. This tube is slotted, as shown at These slots split the tube into four parts. Two oi? these parts (H I will term sleeves and the other two parts 65 tongues. The tongues are slightly shorter than the sleeve" as will be seen in Fig. 6. After the tube slotted the tongues are bent slightly inwardly, as shown in Fig. 5. The cannon pinion arbor (50 is tapered at 66, said taper terminating in a. shoulder 67 which is slightly rounded adjacent the end of the taper, as shown at (38. The end oi the arbor 60 is reduced and squared, as shown at 69, to receive a key.

In assembling, the cannon pinion is placed on the arbor (SO and forced along the same until the pinion 6i abuts against a shoulder 70 (see Fig. l) on the arbor. When in this position, the sleeves (3i frictionally engage the top oi the shoulder (37 and the tongues (35 have snapped down onto the curved portion 68 of the shoulder 6'7. The sleeves, by their frictional engagement with shoulder 67. serve to drive the arbor G0 in unison with the pinion 61; whereas the tongues lock the cannon pinion in position on the arbor and prevent any accidental lateral shifting of the pinion. hen it is desired to set the hands of the clock by the application of a key to the squared end of the arbor, the latter may be turned without turning the pinion 61 or the clock train.

When placed in position, the cannon pinion arbor 60 is journaled in the front and back plates 10 and 13, and when in position the pinion 61 is in mesh with the main driving wheel 24. As previously explained, this arbor drives the clock hands 54 and 57.

It is to be understood that I do not limit myself to the exact construction shown and described, as many changes may obviously be made in point of detail and other embodiments resorted to without necessarily departing from the true spirit and scope of my invention.

lVhat I claim is:

1. In a clock train for portable clocks, in combination, a back plate, a cover plate, a stud secured to the cover plate and extend ing toward the back plate, a main wheel having an annular boss thereon, said main wheel and annular boss being revolubly mounted on the stud and said boss extending with said stud toward the back plate, a spring barrel revolubly mounted on the backplate and having the rim of the barrel concentric'with the said annular boss, and a main spring connected with the rim of the barrel and said boss.

2. In a clock train for portable clocks, in combination a back late, a cover plate, a stud secured to said cover plate, a main wheel revolubly mounted on said" stud,

means comprising a main spring and an escapement and gear train for driving said 'main wheel and controlling its movement,

an intermediate gear wheel carried by the 'main gear, an arbor revolublysmounted in said lates, a gear wheel secured thereto meshing with the said intermediate gear, a

' record carrier mounted on said arbor, a stud mounted on the cover plate, a gear revolubly mounted thereon, and a cannon pinion and arbor revolubly mounted in said plates having a gearthereonmeshing with the gear on the last mentioned stud member, said cannon pinion meshingwith said main wheel and adapted to drive the hour and minute hands. I

3. In a clock train for portable clocks, in combination, a plurality of supporting plates, a stud carried by one of the plates and extending adjacent the other plate, a

main wheel carried by said stud, a spring I barrel carried by said other plate in axial alinement with the aforesaidstud, a main spring in said barrel, aboss extending from said main wheel and revolubly mounted on the stud and concentric with the spring barrel and spring hooks on the said boss and 4 said barrel whereby the said main spring when wound rotates the said boss and main wheel with respect to the barrel.

4. In a clock train for portable clocks, in combination, a pair of supporting plates, a 4 stud carried by one of the plates and extending adjacent the other plate, a main wheel having an annular boss revolubly mounted on said stud and said boss extending away from the plate supporting the 5 stud, aspring barrel revolubly mounted on one plate and in axial alinement with the stud extending toward said plate, and a' main spring connecting at one end with the annular boss and at the other with the 5 barrel.

5. In a clock train for portable clocks, in combination, a pair of supporting plates, a main spring carried in a barrel revolubly mounted in one of said plates, a main wheel revolubly mounted on a stud carried by the signature.

CHARLES H. JENKINS. 

